This is on a 32 bit AMD processor.
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I have a similar installation on an AMD64 (64 bit kernel) and sawfish-ui works fine.

Accepted sawfish into lucid-proposed, the package will build now and be available in a few hours. Please test and give feedback here. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you in advance!

Several problems:
1 I created a test account (with a fresh homedir) and chose sawfish on the login screen, I got nothing on log in. None of my mouse buttons do anything (I think it was middle-click to get the sawfish menu to launch things).

2 rep is not installed and so sawfish-ui still gives me "exec: 8: rep: not found". So the dependencies seem busted.

That said, with rep installed #2 goes away and I can kill metacity, start sawfish and successfully start sawfish-ui.

I have not tried logging into my every-day account with sawfish as the WM yet, I have a lot of state on my desktop that I don't want to get rid of right now.

Accepted sawfish into lucid-proposed, the package will build now and be available in a few hours. Please test and give feedback here. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you in advance!